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Iodine123, used in thyroid therapy, has a halflife of 13.27 hours. How many halflives are required for a 160 mg sample of iodine123 to decay to 5.0 mg?
A) 1.0
B) 32
C) 5.0
D) 0.031
 one year ago
 one year ago
Need help on the following question, Iodine123, used in thyroid therapy, has a halflife of 13.27 hours. How many halflives are required for a 160 mg sample of iodine123 to decay to 5.0 mg? A) 1.0 B) 32 C) 5.0 D) 0.031
 one year ago
 one year ago

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ammubhaveBest ResponseYou've already chosen the best response.0
t = 0 => 160 mg t = 13.27 hrs => 80 mg t = 13.27 * 2 hrs => 40 mg t = 13.27 * 3 hrs => 20 mg t = 13.27 * 4 hrs => 10 mg t = 13.27 * 5 hrs => 5 mg So after 66.35 hrs, i.e. after 5 halflives, there will be only 5 mg left.
 one year ago
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